How to Decode a JWT (Header and Payload Explained)

JWTs are everywhere in APIs and auth. Decoding one by hand is tedious—base64url, JSON, and claims can be confusing. A decoder that shows the header and payload in readable form makes debugging and learning much easier. We walk through the structure of a JWT and how to decode it safely (inspect only; verification is a separate step). Try the free tool on [Buggable.dev](https://buggable.dev) for quick, client-side results.